Automatic deviation rectifying device for telescopic belt conveyor

Abstract

The utility model relates to an automatic deviation rectifying device for a telescopic belt conveyor, and belongs to the technical field of deviation rectifying of belt conveyors. Comprising an upper deviation rectifying mechanism and a lower deviation rectifying mechanism; the upper deviation rectifying mechanism comprises an upper side fixing frame, the upper side fixing frame is fixedly arranged on a machine body of the belt conveyor, an upper side deviation rectifying frame is rotationally arranged in the upper side fixing frame, an upper carrier roller set is arranged on the upper side deviation rectifying frame, and a left vertical upper side vertical roller and a right vertical upper side vertical roller are further rotationally arranged on the upper side deviation rectifying frame. The two upper side vertical rollers are located on the left side and the right side of the conveying belt on the upper side. The lower deviation rectifying mechanism comprises a lower side fixing frame, the lower side fixing frame is fixedly arranged on a machine body of the belt conveyor, a lower side deviation rectifying frame is rotationally arranged in the lower side fixing frame, a lower carrier roller is arranged on the lower side deviation rectifying frame, and a left vertical lower side vertical roller and a right vertical lower side vertical roller are further rotationally arranged on the lower side deviation rectifying frame. The two lower side vertical rollers are located on the left side and the right side of the conveying belt on the lower side. The problem that a traditional telescopic belt conveyor is poor in deviation rectifying effect is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of belt conveyor deviation correction, and in particular relates to an automatic deviation correction device for a telescopic belt conveyor. Background Art

[0002] With the advancement of belt conveyor technology, its application has gradually expanded to enterprises such as ports, power plants, and mines. Belt conveyor deviation is one of the most common operational failures, seriously impacting equipment life and production safety. As a key component of belt conveyors, the importance of corrective devices is undeniable. Corrective devices are typically used on fixed belt conveyors. However, due to the unique operating conditions of telescopic belt conveyors, the machine body often requires periodic disassembly and assembly as the mining face changes, making installation of corrective devices more cumbersome. Traditionally, corrective systems for telescopic belt conveyors rely solely on manual adjustment of hanging roller assemblies. Mining operators have reported poor corrective effects, and manual adjustment requires lifting the conveyor belt and adjusting the slots of the hanging roller assembly, a labor-intensive process. Therefore, a corrective device for telescopic belt conveyors that can automatically correct deviations, is easy to install, and offers effective corrective effects is highly desirable. Utility Model Content

[0003] The utility model overcomes the deficiencies of the prior art and proposes an automatic deviation-correcting device for a telescopic belt conveyor, thereby solving the problem of poor deviation-correcting effect of traditional telescopic belt conveyors.

[0004] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions.

[0005] An automatic deviation-correcting device for a retractable belt conveyor comprises an upper deviation-correcting mechanism and a lower deviation-correcting mechanism; the upper deviation-correcting mechanism comprises an upper fixed frame, which is fixedly arranged on the body of the belt conveyor, an upper deviation-correcting frame is rotatably arranged inside the upper fixed frame, an upper roller group is arranged on the upper deviation-correcting frame, and two vertical upper vertical rollers are rotatably arranged on the upper deviation-correcting frame, and the two upper vertical rollers are located on the left and right sides of the upper conveyor belt; the lower deviation-correcting mechanism comprises a lower fixed frame, which is fixedly arranged on the body of the belt conveyor, a lower deviation-correcting frame is rotatably arranged inside the lower fixed frame, a lower roller is arranged on the lower deviation-correcting frame, and two vertical lower vertical rollers are rotatably arranged on the lower deviation-correcting frame, and the two lower vertical rollers are located on the left and right sides of the lower conveyor belt.

[0006] Furthermore, the upper side fixing frame includes a left and right horizontal upper beam and two vertical upper legs, and the upper ends of the two upper legs are fixedly connected to the left and right ends of the upper beam respectively; a group of clamps are fixedly provided at the lower ends of the end surfaces of the two upper legs close to each other, and the two groups of clamps are fixedly connected to the longitudinal beams on the left and right sides of the belt conveyor body through fixing bolts and fixing nuts.

[0007] Furthermore, the upper side correction frame includes a left and right horizontal upper cross bar and two vertical upper vertical bars, and the two ends of the upper cross bar are fixedly connected to the upper ends of the two upper vertical bars through an upper inclined rod; a vertical upper side rotating shaft is fixedly arranged in the middle of the upper end surface of the upper cross bar, and an external thread is arranged on the upper end of the outer side surface of the upper side rotating shaft.

[0008] Furthermore, an upper rotating hole is provided in the middle of the upper crossbeam, and an upper shaft sleeve is fixed at the lower end of the upper rotating hole by a fixing bolt and a fixing nut, and the upper shaft sleeve is connected to the interior of the upper rotating hole; the upper end of the upper rotating shaft passes through the upper shaft sleeve and the interior of the upper rotating hole in sequence, and a fixing nut is screwed on the upper end of the upper rotating shaft, thereby connecting the upper fixing frame with the upper correcting frame; a bearing is provided between the inner wall of the upper shaft sleeve and the outer wall of the upper rotating shaft.

[0009] Furthermore, two left-right symmetrical upper baffles are fixedly arranged in the middle of the front and rear end surfaces of the upper crossbeam, the upper ends of the upper baffles are fixedly connected to the upper crossbeam, and the lower ends of the upper baffles extend to one side of the upper crossbar; a tightening bolt is screwed to the lower end of each upper baffle, and the end of the tightening bolt faces the side of the upper crossbar.

[0010] Furthermore, the upper roller group is arranged between the lower ends of the two upper vertical rods, and the upper roller group includes three upper rollers, which are arranged in a "︺" shape. The two adjacent upper rollers are rotatably connected by a hinge plate, and the ends of the two outer upper rollers away from the middle upper roller are respectively hinged to the lower ends of the two upper vertical rods; the lower end surface of the conveyor belt on the upper side of the belt conveyor is in rolling contact with the three upper rollers.

[0011] Furthermore, a front and rear horizontal upper fixed rod is fixedly provided at the middle height of the front end surface of the two upper vertical rods, and an upper side vertical roller is fixedly provided at the front end of the upper end surface of the two upper fixed rods.

[0012] Furthermore, the lower side fixing frame includes a left and right horizontal lower cross beam and two vertical lower support legs, and the lower ends of the two lower support legs are fixedly connected to the left and right ends of the lower cross beam respectively; a group of clamps are fixedly provided on the upper ends of the end surfaces on one side where the two lower support legs are close to each other, and the two groups of clamps are fixedly connected to the longitudinal beams on the left and right sides of the belt conveyor body through fixing bolts and fixing nuts.

[0013] Furthermore, the lower side correction frame includes a left and right horizontal lower cross bar and two vertical lower vertical bars, the lower ends of the two lower vertical bars are fixedly connected to the two ends of the lower cross bar respectively; a vertical lower side rotating shaft is fixedly arranged in the middle of the lower end surface of the lower cross bar; a front and rear horizontal lower fixed bar is fixedly arranged at the middle height of the front end surface of the two lower vertical bars, and one of the lower side vertical rollers is fixedly arranged at the front end of the lower end surface of the two lower fixed bars.

[0014] Furthermore, a lower rotating hole is provided in the middle of the lower cross beam, and a lower shaft sleeve is fixedly inserted in the lower rotating hole; the lower end of the lower rotating shaft is inserted in the lower shaft sleeve, and a bearing is provided between the inner wall of the lower shaft sleeve and the outer wall of the lower rotating shaft; two left-right symmetrical lower baffles are fixedly provided in the middle of the front and rear end surfaces of the lower cross beam respectively, the lower ends of the lower baffles are fixedly connected to the lower cross beam, and the upper ends of the lower baffles extend to one side of the lower cross bar, and a tightening bolt is screwed to the upper end of each lower baffle, and the end of the tightening bolt faces the side of the lower cross bar.

[0015] The beneficial effects of the present invention compared to the prior art are as follows:

[0016] Compared with traditional correction devices, this utility model targets the classic circular tube-type retractable belt conveyor, breaking the precedent of this model having no independent correction device. The correction device can realize the automatic correction function without power source through the cooperation of the rotating structure. It has the advantages of simple structure, low cost, quick and convenient installation, and strong correction ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below with reference to the accompanying drawings:

[0018] Figure 1 This is the front view of the upper correction mechanism;

[0019] Figure 2 It is a side view of the upper fixing frame and the upper deviation correcting frame;

[0020] Figure 3 yes Figure 1 AA section view in;

[0021] Figure 4 yes Figure 1 BB cross-sectional view in;

[0022] Figure 5 This is the front view of the lower correction mechanism;

[0023] Figure 6 It is a side view of the lower correcting mechanism;

[0024] Figure 7 yes Figure 5The CC section view in the figure;

[0025] Figure 8 yes Figure 5 DD cross-sectional view in;

[0026] Figure 9 yes Figure 5 EE cross-sectional view in;

[0027] Among them, 1 is the upper crossbeam, 2 is the upper support leg, 3 is the clamp, 4 is the upper crossbar, 5 is the upper vertical bar, 6 is the upper inclined bar, 7 is the upper rotating shaft, 8 is the upper shaft sleeve, 9 is the upper baffle, 10 is the tightening bolt, 11 is the upper roller group, 12 is the upper fixed rod, 13 is the upper vertical roller, 14 is the lower crossbeam, 15 is the lower support leg, 16 is the lower crossbar, 17 is the lower vertical bar, 18 is the lower rotating shaft, 19 is the lower shaft sleeve, 20 is the lower baffle, 21 is the lower roller, 22 is the lower fixed rod, and 23 is the lower vertical roller. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions, and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. The technical solutions of the present invention will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0029] like Figure 1 As shown in FIG. 9 , the utility model provides an automatic deviation-correcting device for a retractable belt conveyor, comprising an upper deviation-correcting mechanism and a lower deviation-correcting mechanism, both of which are fixedly arranged on the body of the belt conveyor.

[0030] The upper deflection-correcting mechanism comprises a gate-shaped upper fixing frame, which comprises a left and right horizontal upper crossbeam 1 and two vertical upper legs 2. The upper ends of the two upper legs 2 are fixedly connected to the left and right ends of the upper crossbeam 1. A set of clamps 3 are fixedly mounted on the lower ends of the end surfaces of the two upper legs 2 on the side close to each other. The two sets of clamps 3 are fixedly connected to the left and right longitudinal beams of the belt conveyor body via fixing bolts and fixing nuts.

[0031] A gate-shaped upper deflection-correcting frame is rotatably mounted within the upper fixing frame. The frame comprises a horizontal upper crossbar 4 and two vertical upper vertical bars 5. Each end of the upper crossbar 4 is fixedly connected to the upper ends of the two upper vertical bars 5 via an upper inclined bar 6. A vertical upper rotating shaft 7 is fixedly mounted in the middle of the upper end surface of the upper crossbar 4. The upper end of the outer surface of the upper rotating shaft 7 is provided with an external thread.

[0032] A upper-side rotation hole is provided in the middle of the upper cross beam 1. At the lower end of the upper-side rotation hole, an upper-side shaft sleeve 8 is fixedly arranged through a fixing bolt and a fixing nut. The upper-side shaft sleeve 8 is in communication with the inside of the upper-side rotation hole. The upper end of the upper-side rotating shaft 7 sequentially passes through the upper-side shaft sleeve 8 and the inside of the upper-side rotation hole, and a fixing nut is screwed on the upper end of the upper-side rotating shaft 7, so as to connect the upper-side fixing frame and the upper-side deviation-correcting frame. A bearing is arranged between the inner wall of the upper-side shaft sleeve 8 and the outer wall of the upper-side rotating shaft 7. The upper-side rotating shaft 7 is rotatably connected to the inside of the upper-side shaft sleeve 8 through the bearing, so that the upper-side deviation-correcting frame rotates horizontally inside the upper-side fixing frame.

[0033] Two symmetrically arranged upper-side baffle plates 9 are respectively fixedly arranged in the middle of the front and rear end faces of the upper cross beam 1. The upper ends of the upper-side baffle plates 9 are fixedly connected to the upper cross beam 1, and the lower ends of the upper-side baffle plates 9 extend to one side of the upper cross bar 4. A set screw 10 is screwed at the lower end of each upper-side baffle plate 9, and the end of the set screw 10 faces the side of the upper cross bar 4. By adjusting the depth of the set screw 10 screwed in, the distance between the end of the set screw 10 and the upper cross bar 4 is controlled, so as to adjust the angle range that the upper-side deviation-correcting frame can rotate.

[0034] An upper idler group 11 is arranged between the lower ends of the two upper vertical rods 5. The upper idler group 11 includes three upper idlers, and the three upper idlers are arranged in a "︺" shape. The adjacent two upper idlers are rotatably connected through a hinge piece, and the ends of the two outer upper idlers far from the middle upper idler are respectively hinged to the lower ends of the two upper vertical rods 5. The lower end face of the conveyor belt on the upper side of the belt conveyor is in rolling contact with the three upper idlers.

[0035] A horizontally arranged front and rear upper fixing rod 12 is respectively fixedly arranged at the middle height of the front end faces of the two upper vertical rods 5. A vertically arranged upper-side vertical roller 13 is respectively fixedly arranged at the front ends of the lower end faces of the two upper fixing rods 12, and the two upper-side vertical rollers 13 are respectively located on the left and right sides of the upper-side conveyor belt.

[0036] The lower deviation-correcting mechanism includes a "凵"-shaped lower-side fixing frame. The lower-side fixing frame includes a horizontally arranged lower cross beam 14 and two vertically arranged lower legs 15. The lower ends of the two lower legs 15 are respectively fixedly connected to the left and right ends of the lower cross beam 14. A set of clamps 3 are respectively fixedly arranged at the upper ends of the side faces of the two lower legs 15 close to each other. The two sets of clamps 3 are respectively fixedly connected to the longitudinal beams on the left and right sides of the fuselage of the belt conveyor through fixing bolts and fixing nuts.

[0037] Inside the lower fixing frame, a "U"-shaped lower deviation rectifying frame is rotatably arranged. The lower deviation rectifying frame includes a horizontally arranged lower cross bar 16 and two vertically arranged lower vertical bars 17. The lower ends of the two lower vertical bars 17 are respectively fixedly connected to both ends of the lower cross bar 16. In the middle of the lower end face of the lower cross bar 16, a vertically arranged lower side rotating shaft 18 is fixedly arranged.

[0038] In the middle of the lower cross beam 14, a lower side rotating hole is arranged. Inside the lower side rotating hole, a lower side shaft sleeve 19 is fixedly inserted. The lower end of the lower side rotating shaft 18 is inserted into the lower side shaft sleeve 19. And between the inner wall of the lower side shaft sleeve 19 and the outer wall of the lower side rotating shaft 18, a bearing is arranged. The lower side rotating shaft 18 is rotatably connected to the inside of the lower side shaft sleeve 19 through the bearing, so that the lower deviation rectifying frame rotates horizontally inside the lower fixing frame.

[0039] On the middle parts of the front and rear end faces of the lower cross beam 14, two symmetrically arranged lower side baffle plates 20 are respectively fixedly arranged. The lower ends of the lower side baffle plates 20 are fixedly connected to the lower cross beam 14. The upper ends of the lower side baffle plates 20 extend to one side of the lower cross bar 16. On the upper end of each lower side baffle plate 20, a set screw 10 is screwed. The end of the set screw 10 faces one side of the lower cross bar 16. By adjusting the depth of the set screw screwed in, the distance between the end of the set screw and the lower cross bar 16 is controlled, so as to adjust the angle range that the lower deviation rectifying frame can rotate.

[0040] Between the upper ends of the two lower vertical bars 17, a horizontally arranged lower supporting roller 21 is rotatably arranged. The lower end face of the conveyor belt on the lower side of the belt conveyor is in rolling contact with the lower supporting roller 21.

[0041] On the middle height positions of the front end faces of the two lower vertical bars 17, two horizontally arranged lower fixing bars 22 are respectively fixedly arranged. On the front ends of the upper end faces of the two lower fixing bars 22, two vertically arranged lower side vertical rollers 23 are respectively fixedly arranged. The two lower side vertical rollers 23 are respectively located on the left and right sides of the conveyor belt on the lower side.

[0042] The working principle of the present utility model is as follows:

[0043] When the conveyor belt on the upper side of the belt conveyor runs off track, the edge on the side where the upper side conveyor belt runs off track will squeeze the upper side vertical roller 13 on the same side, making the upper side vertical roller 13 move towards the other side. The upper side vertical roller 13 will drive the upper deviation rectifying frame to rotate around the upper side rotating shaft 7 until the upper cross bar 4 of the upper deviation rectifying frame contacts the set screw on the upper side baffle plate 9 and is limited. During the rotation of the upper deviation rectifying frame, the upper supporting roller group 11 on the upper deviation rectifying frame rotates synchronously with the upper deviation rectifying frame, so that an included angle is generated between the normal direction of the upper supporting roller and the running direction of the upper side conveyor belt. A centripetal component force is generated on the upper side conveyor belt during the rotation of the upper supporting roller. Under the action of this component force, the upper side conveyor belt gradually resumes normal operation.

[0044] When the conveyor belt on the lower side of the belt conveyor deviates, the edge of the deviated conveyor belt will squeeze the lower vertical roller 23 on the same side, causing the lower vertical roller 23 to move to the other side. The lower vertical roller 23 will then drive the lower correcting frame to rotate around the lower rotating shaft 18 until the lower crossbar 16 of the lower correcting frame contacts the set screw on the lower baffle 20 and is restricted. During the rotation of the lower correcting frame, the lower roller 21 on the lower correcting frame rotates synchronously with the lower correcting frame, so that the normal direction of the lower roller 21 forms an angle with the running direction of the upper conveyor belt, so that the lower roller 21 generates a component force toward the center of the lower conveyor belt during rotation. Under the action of this component force, the lower conveyor belt gradually resumes normal operation.

[0045] This utility model is designed for a classic tubular retractable belt conveyor. It features a set of upper and lower guide mechanisms spaced at regular intervals based on conveyor length and belt deviation, effectively preventing belt deviation. This design, unlike the previous model without independent guide mechanisms, achieves automatic guide function without a power source. It offers advantages such as a simple structure, low cost, quick and easy installation, and strong guide capability, making it suitable for widespread application.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. An automatic deviation-correcting device for a retractable belt conveyor, characterized in that: Including upper correction mechanism and lower correction mechanism; The upper deviation-correcting mechanism comprises an upper fixing frame, which is fixedly arranged on the body of the belt conveyor, an upper deviation-correcting frame rotatably arranged inside the upper fixing frame, an upper roller group (11) being arranged on the upper deviation-correcting frame, and two left and right vertical upper side rollers (13) being rotatably arranged on the upper deviation-correcting frame, the two upper side rollers (13) being located on the left and right sides of the upper conveyor belt; The lower deviation-correcting mechanism comprises a lower fixing frame, which is fixedly arranged on the body of the belt conveyor. A lower deviation-correcting frame is rotatably arranged inside the lower fixing frame. A lower roller (21) is arranged on the lower deviation-correcting frame. Two left and right vertical lower rollers (23) are also rotatably arranged on the lower deviation-correcting frame. The two lower vertical rollers (23) are located on the left and right sides of the lower conveyor belt.

2. The automatic deviation-correcting device for a retractable belt conveyor according to claim 1, characterized in that: The upper fixing frame comprises a left and right horizontal upper crossbeam (1) and two vertical upper legs (2), the upper ends of the two upper legs (2) are fixedly connected to the left and right ends of the upper crossbeam (1) respectively; a set of clamps (3) are fixedly provided at the lower ends of the end surfaces of the two upper legs (2) close to each other, and the two sets of clamps (3) are fixedly connected to the longitudinal beams on the left and right sides of the belt conveyor body respectively through fixing bolts and fixing nuts.

3. The automatic deviation-correcting device for a retractable belt conveyor according to claim 2, characterized in that: The upper deviation-correcting frame comprises an upper horizontal bar (4) and two vertical upper vertical bars (5), and the two ends of the upper horizontal bar (4) are fixedly connected to the upper ends of the two upper vertical bars (5) through an upper inclined bar (6); a vertical upper rotating shaft (7) is fixedly arranged in the middle of the upper end surface of the upper horizontal bar (4), and an external thread is arranged on the upper end of the outer surface of the upper rotating shaft (7).

4. The automatic deviation-correcting device for a retractable belt conveyor according to claim 3, characterized in that: An upper rotating hole is provided in the middle of the upper crossbeam (1), and an upper shaft sleeve (8) is fixedly provided at the lower end of the upper rotating hole by a fixing bolt and a fixing nut, and the upper shaft sleeve (8) is connected to the interior of the upper rotating hole; the upper end of the upper rotating shaft (7) passes through the upper shaft sleeve (8) and the interior of the upper rotating hole in sequence, and a fixing nut is screwed on the upper end of the upper rotating shaft (7), thereby connecting the upper fixing frame and the upper deviation correcting frame; a bearing is provided between the inner wall of the upper shaft sleeve (8) and the outer wall of the upper rotating shaft (7).

5. The automatic deviation-correcting device for a retractable belt conveyor according to claim 4, characterized in that: Two upper side baffles (9) are fixedly provided in the middle of the front and rear end surfaces of the upper cross beam (1), respectively, and are symmetrical. The upper ends of the upper side baffles (9) are fixedly connected to the upper cross beam (1), and the lower ends of the upper side baffles (9) extend to one side of the upper cross bar (4); a fixing bolt (10) is screwed to the lower end of each upper side baffle (9), and the end of the fixing bolt (10) faces one side of the upper cross bar (4).

6. The automatic deviation-correcting device for a retractable belt conveyor according to claim 5, characterized in that: The upper roller group (11) is provided between the lower ends of the two upper vertical rods (5), and the upper roller group (11) includes three upper rollers, which are arranged in a "︺" shape. Two adjacent upper rollers are rotatably connected via hinged plates, and the ends of the two outer upper rollers away from the middle upper roller are respectively hinged to the lower ends of the two upper vertical rods (5); the lower end surface of the conveyor belt on the upper side of the belt conveyor is in rolling contact with the three upper rollers.

7. The automatic deviation-correcting device for a retractable belt conveyor according to claim 6, characterized in that: A front and rear horizontal upper fixed rod (12) is fixedly provided at the middle height of the front end surface of the two upper vertical rods (5), and an upper side vertical roller (13) is fixedly provided at the front end of the upper end surface of the two upper fixed rods (12).

8. The automatic deviation-correcting device for a retractable belt conveyor according to claim 1, characterized in that: The lower fixing frame comprises a left and right horizontal lower crossbeam (14) and two vertical lower legs (15), the lower ends of the two lower legs (15) are fixedly connected to the left and right ends of the lower crossbeam (14), respectively; a group of clamps (3) are fixedly provided on the upper ends of the end surfaces of the two lower legs (15) on one side close to each other, and the two groups of clamps (3) are fixedly connected to the longitudinal beams on the left and right sides of the body of the belt conveyor through fixing bolts and fixing nuts.

9. The automatic deviation-correcting device for a retractable belt conveyor according to claim 8, characterized in that: The lower side deviation correction frame includes a left and right horizontal lower cross bar (16) and two vertical lower vertical bars (17), the lower ends of the two lower vertical bars (17) are fixedly connected to the two ends of the lower cross bar (16); a vertical lower side rotating shaft (18) is fixedly arranged in the middle of the lower end surface of the lower cross bar (16); a front and rear horizontal lower fixed bar (22) is fixedly arranged at the middle height of the front end surface of the two lower vertical bars (17), and a lower side vertical roller (23) is fixedly arranged in front of the front ends of the lower end surfaces of the two lower fixed bars (22).

10. The automatic deviation-correcting device for a retractable belt conveyor according to claim 9, characterized in that: A lower rotating hole is provided in the middle of the lower crossbeam (14), and a lower shaft sleeve (19) is fixedly inserted in the lower rotating hole; the lower end of the lower rotating shaft (18) is inserted in the lower shaft sleeve (19), and a bearing is provided between the inner wall of the lower shaft sleeve (19) and the outer wall of the lower rotating shaft (18); two left-right symmetrical lower baffles (20) are fixedly provided in the middle of the front and rear end surfaces of the lower crossbeam (14), the lower ends of the lower baffles (20) are fixedly connected to the lower crossbeam (14), and the upper ends of the lower baffles (20) extend to one side of the lower crossbar (16), and a fixing bolt (10) is screwed to the upper end of each lower baffle (20), and the end of the fixing bolt (10) faces one side of the lower crossbar (16).

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